Ultrasonic is sound that accelerates down into a ”Sonotrode” (tool) resulting in a mechanical hammering effect. This pounding generates heat in most fabrics.

Ultrasonic is another technology for joining plastic materials.

The heat needs to penetrate the first layer in order to join the second layer.

Advantages with ultrasonic welding:
+ Can be used for non-dielectric materials
+ Suitable for detailed welding

Disadvantages with ultrasonic welding:
– The technology creates a high pitch sound
– It is difficult to weld more than two material layers without damaging the surface of the material and causing burns
– The weld area is very limited and the technology is not suitable for larger applications